Arduino Stimulation Simulator

This module simulates the action of a stimulation unit by modifying a GPIO of an ardiuno, which needs to be prepared to read from its serial connection.

The module will watch an LSL stream as defined in ./configs/arduino_stim_sim_config.toml

Code on the Arduino

This could be an example of the code flashed to the Arduino

const int inBufferSize = 32;
char inBuffer[inBufferSize];
int intFromSerial;
boolean newData = false;

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  
  Serial.begin(19200);
  Serial.println("Serial started!");

  // Use pin 2 for our signal
  pinMode(2, OUTPUT);

}

//============
void loop() {
    recvUntilNewLine();

    if (newData == true) { 
        if (strcmp(inBuffer, "u") == 0) {
          // Serial.println("Setting HIGH");
          digitalWrite(2, HIGH);
        } else if (strcmp(inBuffer, "d") == 0){
          // Serial.println("Setting LOW");
          digitalWrite(2, LOW);
        }
        // showParsedData();
        newData = false;
    }
}

//============

void recvUntilNewLine() {
    static byte ndx = 0;
    char endMarker = '\n';
    char rc;

    while (Serial.available() > 0 && newData == false) {
        rc = Serial.read();
          if (rc != endMarker) {
              inBuffer[ndx] = rc;
              ndx++;
              // in case of overflow
              if (ndx >= inBufferSize) {
                  ndx = inBufferSize - 1;
              }
          }
          else {
              inBuffer[ndx] = '\0'; // terminate the string
              ndx = 0;
              newData = true;
          }
        // Echo back for debugging
        Serial.println(inBuffer);
    }
}

//============
void showParsedData() {
  Serial.print("inBuffer : {");
  for (int i=0; i < strlen(inBuffer) / sizeof(inBuffer[0]); i++){
    Serial.print(inBuffer[i]);
    Serial.print(", ");
  }
  Serial.println("}");

  Serial.print("Integer ");
  Serial.println(intFromSerial);

}